Gas Saturation Resulting from Methane Hydrate Dissociation in a Porous Medium: Comparison between Analytical and Pore-Network Results

2013 ◽  
Vol 117 (21) ◽  
pp. 11104-11116 ◽  
Author(s):  
Ioannis N. Tsimpanogiannis ◽  
Peter C. Lichtner
Keyword(s):  
Porous Medium ◽  
Methane Hydrate ◽  
Pore Network ◽  
Hydrate Dissociation ◽  
Gas Saturation

scholarly journals Study of the Critical Pore Radius That Results in Critical Gas Saturation during Methane Hydrate Dissociation at the Single-Pore Scale: Analytical Solutions for Small Pores and Potential Implications to Methane Production from Geological Media

Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 210
Author(s):  
Ioannis Nikolaos Tsimpanogiannis ◽  
Emmanuel Stamatakis ◽  
Athanasios Konstantinos Stubos
Keyword(s):  
Porous Media ◽  
Analytical Solutions ◽  
Methane Production ◽  
Methane Hydrate ◽  
Pore Radius ◽  
Hydrate Dissociation ◽  
Gas Saturation ◽  
Dissociation Temperature ◽  
Critical Gas Saturation ◽  
Pore Body

We examine the critical pore radius that results in critical gas saturation during pure methane hydrate dissociation within geologic porous media. Critical gas saturation is defined as the fraction of gas volume inside a pore system when the methane gas phase spans the system. Analytical solutions for the critical pore radii are obtained for two, simple pore systems consisting of either a single pore-body or a single pore-body connected with a number of pore-throats. Further, we obtain critical values for pore sizes above which the production of methane gas is possible. Results shown in the current study correspond to the case when the depression of the dissociation temperature (due to the presence of small-sized pores; namely, with a pore radius of less than 100 nm) is considered. The temperature shift due to confinement in porous media is estimated through the well-known Gibbs-Thompson equation. The particular results are of interest to geological media and particularly in the methane production from the dissociation of natural hydrate deposits within off-shore oceanic or on-shore permafrost locations. It is found that the contribution of the depression of the dissociation temperature on the calculated values of the critical pore sizes for gas production is limited to less than 10% when compared to our earlier study where the porous media effects have been ignored.

Pore-network study of methane hydrate dissociation

2006 ◽  
Vol 74 (5) ◽  
Author(s):  
Ioannis N. Tsimpanogiannis ◽  
Peter C. Lichtner
Keyword(s):  
Methane Hydrate ◽  
Pore Network ◽  
Hydrate Dissociation

scholarly journals Methane and Carbon Dioxide Hydrate Formation and Dissociation in Presence of a Pure Quartz Porous Framework Impregnated with CuSn12 Metallic Powder: An Experimental Report

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5115 ◽  
Author(s):  
Alberto Maria Gambelli ◽  
Giulia Stornelli ◽  
Andrea Di Schino ◽  
Federico Rossi
Keyword(s):  
Carbon Dioxide ◽  
Porous Medium ◽  
Methane Hydrate ◽  
Hydrate Formation ◽  
Metallic Powder ◽  
Equilibrium Curve ◽  
Hydrate Dissociation ◽  
Porous Framework ◽  
Made In ◽  
The Ideal

Hydrate formation and dissociation processes were carried out in the presence of a pure quartz porous medium impregnated with a metallic powder made with a CuSn12 alloy. Experiments were firstly made in the absence of that powder; then, different concentrations were added to the porous medium: 4.23 wt.%, 18.01 wt.%, and 30.66 wt.%. Then, the hydrate dissociation values were compared with those present in the literature. The porous medium was found to act as an inhibitor in the presence of carbon dioxide, while it did not alter methane hydrate, whose formation proceeded similarly to the ideal trend. The addition of CuSn12 promoted the process significantly. In particular, in concentrations of up to 18.01 wt.%, CO2 hydrate formed at milder conditions until it moved below the ideal equilibrium curve. For methane, the addition of 30.66 wt.% of powder significantly reduced the pressure required to form hydrate, but in every case, dissociation values remained below the ideal equilibrium curve.

scholarly journals Numerical analysis of experimental studies of methane hydrate dissociation induced by depressurization in a sandy porous medium

2018 ◽  
Vol 230 ◽  
pp. 444-459 ◽  
Author(s):  
Zhenyuan Yin ◽  
George Moridis ◽  
Zheng Rong Chong ◽  
Hoon Kiang Tan ◽  
Praveen Linga
Keyword(s):  
Porous Medium ◽  
Numerical Analysis ◽  
Methane Hydrate ◽  
Experimental Studies ◽  
Hydrate Dissociation

TEMPERATURE CHANGES FOR METHANE HYDRATE DISSOCIATION IN DIFFERENT CLASS DEPOSITS BY DEPRESSURIZATION

2018 ◽  
Author(s):  
Mingjun Yang ◽  
Yi Gao ◽  
Hang Zhou ◽  
Bingbing Chen ◽  
Yongchen Song
Keyword(s):  
Methane Hydrate ◽  
Hydrate Dissociation ◽  
Temperature Changes

scholarly journals Formation of a Low-Density Liquid Phase during the Dissociation of Gas Hydrates in Confined Environments

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 590
Author(s):  
Lihua Wan ◽  
Xiaoya Zang ◽  
Juan Fu ◽  
Xuebing Zhou ◽  
Jingsheng Lu ◽  
...  
Keyword(s):  
Natural Gas ◽  
Methane Hydrate ◽  
Phase State ◽  
Solid Phase ◽  
Potential Method ◽  
Methane Hydrates ◽  
Low Density ◽  
Hydrate Dissociation ◽  
State Of Water ◽  
Confined Environment

The large amounts of natural gas in a dense solid phase stored in the confined environment of porous materials have become a new, potential method for storing and transporting natural gas. However, there is no experimental evidence to accurately determine the phase state of water during nanoscale gas hydrate dissociation. The results on the dissociation behavior of methane hydrates confined in a nanosilica gel and the contained water phase state during hydrate dissociation at temperatures below the ice point and under atmospheric pressure are presented. Fourier transform infrared spectroscopy (FTIR) and powder X-ray diffraction (PXRD) were used to trace the dissociation of confined methane hydrate synthesized from pore water confined inside the nanosilica gel. The characterization of the confined methane hydrate was also analyzed by PXRD. It was found that the confined methane hydrates dissociated into ultra viscous low-density liquid water (LDL) and methane gas. The results showed that the mechanism of confined methane hydrate dissociation at temperatures below the ice point depended on the phase state of water during hydrate dissociation.

X-ray Computed Tomography Observation of Methane Hydrate Dissociation

2002 ◽  
Author(s):  
Liviu Tomutsa ◽  
Barry Freifeld ◽  
Timothy J. Kneafsey ◽  
Laura A. Stern
Keyword(s):  
Computed Tomography ◽  
Methane Hydrate ◽  
Hydrate Dissociation ◽  
X Ray ◽  
X Ray Computed
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